脉冲电的作用有哪些？

A. Date of the first edition
B. Date of the edition and，if applicable，the revision
C. Information on the sounding datum
D. Information on which IALA buoyage system applie

A. 相当
B. 快
C. 慢

A. 后带
B. 前带
C. 带现象
D. 等价带
E. 拖尾